I've read the short story, it's pretty good. It's one in a series about "Kane", the biblical Cain, who can't die, and who roams around your basic fantasy setting killing monsters. This story is an atmospheric locked room mystery. Kane is trapped in a castle with a bunch of people. Killings begin, a werewolf is to blame - who is the werewolf? Interesting in that the eventual culprit is not a man who turns into a wolf, but an immortal wolf who can take on human form and control a pack of ordinary wolves.